66000556 has 6 divisors (see below), whose sum is σ = 115500980. Its totient is φ = 33000276.

The previous prime is 66000553. The next prime is 66000569. The reversal of 66000556 is 65500066.

It is not an unprimeable number, because it can be changed into a prime (66000553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8250066 + ... + 8250073.

Almost surely, 2^66000556 is an apocalyptic number.

It is an amenable number.

66000556 is a deficient number, since it is larger than the sum of its proper divisors (49500424).

66000556 is a wasteful number, since it uses less digits than its factorization.

66000556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16500143 (or 16500141 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 66000556 is about 8124.0726239984. The cubic root of 66000556 is about 404.1251368719.

The spelling of 66000556 in words is "sixty-six million, five hundred fifty-six", and thus it is an aban number.